Question

(х+2 3/13)-1 7/36=4 5/39 второй пример (х-3/7)-2/12=1/7
дам 100 баллов​

Answer 1

Пошаговое объяснение:

(х + 2 3/13) - 1 7/39 = 4 5/39

х + 2 3/13 = 4 5/39 + 1 7/39

х + 2 3/13 = 5 12/39

х = 5 12/39 - 2 3/13

х = 5 12/39 - 2 9/39

х = 5 3/39

х = 5 1/13

(х - 3/7) - 2/12 = 1/7

х - 3/7 = 1/7 + 2/12

х - 36/84 = 12/84 + 14/84

х - 36/84 = 26/84

х = 26/84 + 36/84

х = 62/84

х = 31/42

Answer 2

Відповідь:

1) $x=3\frac{43}{468}$

2)$x=\frac{31}{42}$

Покрокове пояснення:

1)

$(x+2\frac{3}{13} )-1 \frac{7}{36} =4 \frac{5}{39} \\\\x=4 \frac{5}{39}-2\frac{3}{13} +1 \frac{7}{36}\\\\x=\frac{161}{39}- \frac{29}{13} +\frac{43}{36} \\\\x=\frac{161-87}{39}+ \frac{43}{36}\\\\x=\frac{74}{39}+\frac{43}{36}\\\\\\\x=\frac{(74*36)+(43*39)}{36*39} \\\\x= \frac{4341}{1404}= \frac{1447}{468}=3\frac{43}{468}$

2)

$(x-\frac{3}{7})-\frac{2}{12}=\frac{1}{7} \\\\x=\frac{1}{7}+\frac{3}{7}+\frac{2}{12}\\\\x=\frac{4}{7}+ \frac{2}{12}\\\\x=\frac{4*12+2*7}{7*12}=\frac{62}{84} =\frac{31}{42}$